Grinding machine



March 4, 1952 A. D. APPLEBY 2,587,952

- GRINDING MACHINE Filed Dec. 27, 1946 a Sheets-Sheet 1 IN V EN TOR. Y

m flTTOR/VEX "MI" W March 4, 1952 A. D. APPLEBY GRINDING MACHINE 8Sheets-Sheet 2 Filed Dec. 27, 1946 INVENTOR. flmedeeflflpplelzy Z I HISATTORNEY March 4, A. D. APPLEBY 2,587,952

GRINDING MACHINE Filed Dec. 2'7, 1946 8 Sheets-Sheet 5 INVENTOR.

' H16 ATTOR NE'Y March 4, 1952 A. D. APPLEBY GRINDING MACHINE 8Sheets-Sheet 4 Filed Dec. 27, 1946 IN V EN TOR.

flmedee' D. flppleb y HIS flTTORNE'Y March 4, 1 952 A. D. APPLEBY ,587,

GRINDING MACHINE Filed Dec. 27, 1946 a Sheets-Sht 5 82 zzvmvrom.

0 flm edee D. flppleby I BY v 3 His 'r'romyEr March4, 1952 -B 2,587,952

GRINDING MACHINE Filed Dec. 27, 1946 8 Sheets-Sheet 6 J06 106 In:

INVENTOR.

flmecle D. fl leb I BY MW HIS A TTORNEY March 4, 1 952 D, 'P 2,587,952

GRINDING MACHINE Filed Dec 27, 1946 8 Sheets-Sheet 7 1&5 110 IN VEN TOR.

.Amedee D. flppleby ATTORNEY March 4, 1952 E Y I 2,581952 GRINDINGMACHINE Filed Dec. 27, 1946 s Sheets-Sheet a :94 INVENTOR.

AmedeD/lppleby HIS ATTORNEY Patented Mar. 4, 1952 f-UNITED STATES-PATENTOFFlCE GRINDING MACHINE Amedee D. Appleby, Odessa, Tex.

Application December 27, 1946, Serial No. 718,738

8 Claims. (01. 51-105) '..1.This invention relates to improvements ingrinding machines of the character adapted particularly for'the grindingof ball or roller hearing races on odd or irregularly shaped devices,such'as the segments of rock bits used on rotary well'drills in thedrilling of deep wells.

While various machines have been proposed heretofore for grinding thecups and cones of rotary bits and the like, these for the most part havelacked the flexibility for performing the desired grinding action andhave not been constructed so as to be capable of grinding both theconvex and concave races in cones and cups, as is often desired. Oneobject of this invention is to improve the construction of grindingmachines, so that a machine may be capable of grinding both the cups andcones of a rock bit or other parts of an irregulaf piece of machinerywithout requiring'separate machines or devices for the respective con-'vex' and concave objects.

Another object of the invention is to provide agrinder that may beadjusted readily with respect to the work and on which the work may besecured in place with facility for the performance thereon of thenecessary grinding operation. Still another object of the invention isto improve the construction of the grinding machine to perform thedesired grinding operation by means of a machine which is simple inconstruction, light in weight, and which may be moved readily from placeto place, as desired.

In'carrying out these objects, a grinding machine may be so constructedas to provide for mounting of the object thereon and securing it inproper relation to the grinding element. Provision is made to adjust theposition of the support and the grinding element relative to each otherso these may be brought into the proper relation, both axially andangularly, for the proper alignment and positioning of the respectiveparts of the machine and to provide for the correct operativerelationship between these parts. Both the grinding element and themounting for the work may be power driven in operative relation toaccomplish the desired grinding action. By the adjustments provided, themachine can be used for grinding the cups and cones of both convex andconcave races, or

other irregularly shaped objects, as desired.

Certain embodiments of the invention are illustrated in the accompanyingdrawings, in which: 1 is a perspective view of one form of grindingmachine. embodying this invention;

Fig. 2 is a side elevation of the operating structure thereof;

Fig. 3 is a verticalsectional view through the grinding portion of themachine, substantially on the line 33 of Fig. 2;

Fig. 4 is a horizontal sectional view through the machine showing thework holder in plan, substantially on the line 4-4 of Fig. 2;

Fig. 5 is a horizontal section substantially on the line 5-5 of Fig. 2,and showing the driving connections for the operating parts;

Fig. 6 is a vertical section through the jack shaft mounting on the line6-.B of Fig. 2;

Fig. '7 is a detail horizontal section through the spindle mountingclamp on the line l -l of Fig. 2;

Fig. 8 is a longitudinal sectional View through the work-holder on theline 8-8 of Fig. 4;

Fig. 9 is a transverse sectional view therethrough on the line 9--9 ofFig. 2;

Fig. 10 is a perspective side view of a modified form of the invention;

Fig. 11 is a view similar to Fig. 10, but from the opposite sidethereof; and

Fig. 12 is a perspective view of the rotary table as shown in thismodified form.

Referring to Figs. 1 and 2 of the drawings, the operating mechanism ofthe machine is shown as mounted on a supporting stand which may beseated on the floor, although any other suitable form of mounting may beused, as desired. This stand is formed by a base l, upon which issupported an upright standard 2. Carried by the upper end of thestandard 2 is a supporting member 3, shown as in the form of a platewhich is provided with a sleeve 4 fitted over the standard 2, and theplate extends transversely to opposite sides of the standard andsupports thereon the operating mechanism of the machine.

Referring to Figs. 1, 2 and 6, the support 3 has upstanding therefrom abushing 5, fixed to the support and internally threaded forscrewthreaded connection with the threaded lower portion 6 of anupstanding sleeve 1. These parts may be locked together by a handwheel8, which is screw-threaded on the portion 6 of the sleeve into abuttingrelation with the upper end of the bushing 5. This forms a support forthe sleeve 1 and holds it rigidly in place for mounting the grindingspindle as hereinafter described.

Telescoped over the upper end portion of the sleeve 1 are spacedbushings 9 and I0 which-are also journaled on the sleeve 1 and arecapable of vertical adjustment relative thereto. The bushings 9 and [0are supported in their elevated positions by the skirt portion l l of ahandwheel 3 I2 which is'screwed onto the threaded portion 6 of thebushing 7. By adjusting the handwheel I2, the bushings 9 and I may beadjusted vertically relative to the sleeve 1.

The bushings 9 and H! are held in spaced relation by a clamping segment43 which fits between the bushings 9 and H3 in embracing relation withthe sleeve l, as shown in Figs. 6 and 7. The clamping segment [3 isattached through a journal connection. to the inner'jend of a threadedstem 14' which is screw-threaded through a bushing l5, and is providedwith crank 16 on the outer end thereof, as a suit- Lthejbushing 44 andis journaled in anti-friction able means for rotating the threaded ;stem1.4, as shown clearly in Fig. '7. The threaded bushing is mounted on abracket l'l- Whichextends in bridging relation between theadjacent;

ends of the bushings 9 and i0, as shown in Figs. 1 and 2. The threadedstem It may be adjusted to press the clamping segment 13 into frictionalengagement: with the periphery of the sleeve 1 for securing the bushings9 and :llliin adjusted-positions vertically-along the .axisof thesleeve.

Extending horizontally from-'tthe-bushings- 9 and'llLare supportxarmsI8.and l9,"respectively, rigidly .attachedto the bushingsatnne endjas bywelding, and-at the opposite end 'bEiIIg'LSimI- larlyattachedto anupright sleeve 20 having an axis extending parallel with the axis of thesleeve 1 andcarriedthereby for swinging movement to .differentpo'sitionsrelative thereto. i

As shown "in Fig. '3, zthe' sleeve 20 supports a grinding spindle: 2|,journaledatherein by antifrictio'n bearings 22 and 23 :which'areconfinedinwfthe :sieeve by. adjustment nuts 24 andr25, having screw-threaded.connection with opposite endportions of'the sleeve. a

The lower end of the grinding spind1e;.2.l is shown as provided with agrinding element 26, such as an emery wheel, althoughany suitable formof abrasive devicemay be provided thereon as desired. j -The upper 'end'of the grinding spindle 2|; has a pulley 21 fixed thereon: The'pulley 21is shown in- Figs. 1 and 2, as connectediby a belt 28 with apulley 29,-fixedto the upper end 'oi'a jack shaft3il-(Fig. 6). I I i i-The jackshafttu extends vertically through the sleeve 1" and is journaledr inanti-friction bearings 3| and .32 therein. The bearingsfii and 32 may beadjusted and-are confined by adjustment nuts 33' 'ar'1d 554;v whichare'threaded into-opposite .ends of :the sleeve in theform illustrated gThe lower endof i the jack shaft 30 is pro.- vided'with' a pulley35fixed'thereonp The pulley 35 is connected through a driving'beltfifiwith apulley. 31- mounted on the armature shaft of? an electric motor38, in the form illustrated in Figs. '1 and 2, which-forms the .sourceof power. forndriving' the operative parts of.- the machine. .Theelectric motor: 38 is. shown as mountedonbrackets 39, secured to .oneend. of the supportflv The spindle 2! is: capable of axial adjustmentrelative to thesupport sleeve 1, as well as circumferential adjustmentrelative thereto; To provide for these adj ustments I have shown an arm40,. extending radially fromthebushing 9 inthe Opposite-direction fromthe supporting armv l8. Theouterend of the arm v4! carries a crank rod41, journaled therein on .awswivel, thethreaded portion otwhich rod isshown as engaging n internally. threaded. bushing" 32,

4 mounted between upstanding posts 43 shown as slightly spaced apart andcarried bythe support 3. This will provide adjustment of the arm 40about the axis of the sleeve 7, thereby circumferentially adjusting thegrinding spindle 2| therearound. It will permit also axial adjustment ofthe spindle 2| relative to the sleeve 1, while maintaining the sameangular position relativethereto, which is permitted by theswiveledconnection" of thercrank rod 4!. with the arm 40.

Referring to Fig. 3, the opposite end of the support 3 is shown asformed with a depending bushing M. A shaft 15 extends upwardly throughbearings 46 and 41, adjacent its opposite ends.

Mounted'on the upper end of the shaft 45 is a,.turntable .48, which isnot only keyed to the shaft at 49, but is also secured rigidly there-The turntable 48 forms the work support and has provision thereon forsupportingthe work. inxian operative relation with- (the rindingelement26. .In the formxof the invention. illustrated in Figs.- 3, 8 and19, in.whichthe: work to; be-giound mayucomprise elements ofa .rock .bit,generally indicated at-B in .Fig;8,' such as aracewayaR on 2 a bitsegment; .-provision sis imade. for .mounting -this segment on theturntable 48: for adjust? ment tozdifferentangularpositions. withrespect toithe grinding element 126.; i In this-form,anadjustable:supportsisprovided at, .51 havingan .eye portion .52: alongioneiedge thereof; the su-pportfil being shown as preferably in the formof a plate. Theeye portion 52is sleeved, over :au'rod ;53 with. which it:has screwthreaded. adjustment at; 54, sfo'r1 adjustment of the support,5 I., longitudinally ofj the rod 53 uponrotation .of. saidv rod.. TherOd 53, is journaled in brackets 55 and56; upstanding from the turntable48, and issprovided with aahand crank 51, as a suitable -means foradjustment of. the rod to accomplish the. desired I adjustment f1 hpport.5na;illhe suppo t 1115 a oeapable :of being {tilted todifferent-angular posii n .b means f adlllstine rew 56 avhicharsthreaded. through, ear .9 fo ed on op osite ede sot he s ppor fil n-bear uponwt e upp ac o t e turnt le 8 aswill ..gv dentyfmm F san M j .As c su porti 'shown M 0. a mounte u on support 51,- The sup rtfi lh s slve w ti i uri a ed 021s ra ii ithwhiqnit lso as; trewr hre d d.sonnt tizl $01 ad u m of. the u e 6&9 alone t e wt rtfi upo mating 9 he. d,Z-;-. .i=i r d. ;st Wn-a$ provided wi th a hand crank 63 for turningmovement thereoflf. This rod is. journaled'inupstanding brackets,tdmounted onthefsupportil, The support 6!} is cana blefoftransvers'adlustment by .an adjusting" screw 65, "threaded through' anar 65 rm dfln fs t 69 'andin i i ment with" the upper face of thesupport 5 l. f Mounted on the Support 6E! is'ajig' fixture 61 which is"illustrative" of mountings that may; "be used onthe'rotary table forholding and positioning an-nregui r object in grinding relation j with.

to confine the latter therein whenfpressedagainst the inner side of thefixture by an angularly shaped dog 68 mounted on a fulcrum 69 upon thesupport 60, as shown in Fig. 8. One end of the dog 68, is engaged by ascrew shank 10, shown as having threaded connection with the support 68and provided with a hand crank for rotation thereof to tilt the dog 68on its fulcrum 89 and cause one end of the dog to be turned intransverse relation with the under side of the segment B, holding thelatter securely in, the jig, fixture 61.

The support 60 is shown as having upstanding sides between which the jigfixture 81 is fitted as will be evident from Figs. 8 and 9. This fixtureis adapted to be secured in place on the support 88, for which purposeit is provided with a lug 1| engaged by a cross bar 12 that extendstransversely over the jig fixture, as shown in Fig. 9. The opposite endsof the cross bar 12 are confined by tie bolts 13 connected therewith andextending downwardly to the turntable 48. The upper ends of these bolts13 are provided with wing nuts 14 for tightening the cross bar 12securely upon the lug ll of the jig fixture.

A pair of dowel pins 15 protrude from the respective side faces of thejig fixture 61, perpendicularly thereto, in position to engage holes inthe faces of the bit segment B which will provide a definite indexing ofthe bit body segment with respect to the jig fixture to insure properalignof swinging said arms to move the shaft 19 in an are about the axisof the pin 85. The handle 81 may be secured in an adjusted position bymeans ment of the raceway R, with the abrasive element 26. By having thedowel pins 15 positioned ular thereto in accurate spaced relation, so asto interengage with holes provided in the rock bit segment, the lattermay be brought quickly into I, accurate alignment without requiringadjust, ment, and segments presented and removed'in After the bitsegment B is in place and confined r by the dowel pins 15, fitting intoholes in the segment, the clamp 88 is moved into engagement with theunder side of the bit segment B, by the manipulation of the adjustingmember 10 and pressed firmly thereagainst to confine the shank of thebit segment within the V-shaped jig fixture 61. This insures a precisefit between the bit segment and the jig fixture and accurately positionsthe work with respect to the abrasive ele-' ment.

As shown in Figs. 1 to 3, the lower end of the shaft on which theturntable 48 is mounted, carries a pulley I6 keyed thereto. A belt 11extends around the pulley l6 and around an idler pulley 18 mounted on anupright shaft 19 (Fig. 5) The shaft 19 also carries a pulley 88 ofappreciably larger diameter than the pulley 18 andthe latter is alsomaterially reduced with respect to the pulley 16 to accomplish anappreciable speed reduction in the driving of the shaft 45. The pill ley88 is operatively connected by a belt 8| with a pulley 82 securedrigidly on the lower end of the jack shaft 38, as shown in Figs. 5 and6, to be driven from the motor 38.

The shaft 19 is journaled in a sleeve 83 caron both faces of the jigfixture 81 and perpendicof a notched arcuate segment 88, adapted to beengaged by a spring-pressed latch 89.

As will be evident from Fig. 5, an arcuate adjustment of the position ofthe shaft 19 to the right will loosen the belt 11, while an adjustmenttoward the left will tighten the belt on the pulleys l6 and 18. Thus thebelt tightener serves as a clutch for the rotation of the turntable 48when shifted toward the right or left from the position shown. When thebelt is in proper tightened relation, the parts may be secured rigidlyby the latch 88.

In the operation of the machine, a rock bit segment B, in the form ofthe invention illustrated,

is fitted and clamped to the jig fixture 61, as shown in Fig. 8, and issecured in place by the v clamp 68, held by the screw shaft 10. In thisnally at right angles to each other, as well as to tilt either of thesupports, and to raise and lower the grinding element 26, the axis ofthe bearing race R can be brought into the proper axial, alignedrelation with respect to the axis of the turntable 48. This provides auniversal movement for obtaining a correct adjustment of the work.

The bearing race R is shown as having a concave race cut therein. Whenthe parts are properly adjusted, the turntable 48 is rotated in axialalignment with the bearing race R; the axis of the abrasive element 26is offset with respect thereto, while the latter is rotated at a highrate of speed as compared with the lower rate of speed of rotation ofthe turntable. This will cause a groove to be cut in the bearing'race.

The abrasive element 26 is adjusted eccentrically by the screwadjustment 4| to move the abrasive element toward and from the axis ofthe bearing race R. This element 4| adjusts the feed of the abrasiveelement during operation which adjustment is possible for differentadjusted positions vertically of the abrasive element.

The formed abrasive element 28 may be used for internally grinding incups or for externally grinding on raceways of cones, by adjustment ofthe screw 4| thereby causing a bodily shifting of the axis of thegrinding element toward and from the center axis of the work. The handwheel l2 provides for vertical adjustment of the abrasive element withrespect to the work. When the abrasive element is in correct adjustedposition, the threaded stem i4 forces the clamping segment IS in bindingengagement with the upper end portion of the sleeve 1.

-While the adjustments have been described with respect to an operationon a bearing raceway, positioned substantially in axial alignment withthe shaft 45, it is appreciated thatthe ad justments of the supports 5|and are such that 7 ed on a shaft II9 by a belt I20.

thei'center ofiairialrotation of the cup orcone of a'bearing racewaymaybe made eccentric with respectto the shaft ML'and with the spindle 2I'positioned in axialtalignment with the Shaft-245,.

when an orbital movement is' then accorded to the work, inv such mannerthat the grinding element is in contact relation with aside of the workwhile the latter is rotated about the abrasive element 'which operatesat a high rate of speed.

It will be appreciated that the unit is provided with variousadjustments to accommodate either large or small races or for grindingraces on irreg-ularlyshaped "objects, such as may be used on a rockbitbody segment, ora true race maybe ground on any element whiohmay befitted in a jig, even-though the element being actedon is irregular inshape or has special eccentricities from the standard, and have sleevesI! and 38' secured to the outer ends of-the" arms Q95 and I06,respectively, which sleevessecure a tubular shaft housing Iili) in asubstantially vertical position.

*AmotOr I I0 is mounted on the outer portionof the base IIlI and has abelt II I encircling a pulley I'I'2 onthe motor Ilil'and'a pulleyI'lion'a shaft I Mthat is journaled in bearings I I5 and I i6substantially parallel to the standard H32;- The"up-' perend ofthe'shaftI I l'c'arries a pulley I Il' which is in driving connection with apulley I-I B'mount- The shaft II d also carries a'pulley I2I whichdrives a larger pulley I22 through belt I23 which" encrcles saidpulleys. The pulley I22 is1mounted on alshaft I24 which has a pulley I25directly below said pulley I22. A belt I26 (Fig. 11) encircles ,thepulley 12 d and a pulley I21, which pulley IZ'I is secured to a shaft(not shown) t0 which 'a rotary table I28 is secured. The shaft of therotary table I28'is mounted in bearings I29 in the pivotal frame I 03.

I 'A holding and truin J'iglgenerallyj designated" at J, isimounted ontop ofrotary table I28 on 'a screw-threadedtransverse shaft I30(Figf12);

extending substantially diametrically across the rotary table I28 andcarries a table .I3I upoii whicha screw-threaded shaft I32 is mountedthat carries ajtable. I33, A holding fixture IE4 is' mounted on top ofthe table I33 and has dowel which woudnot adapt it for use in aconventional ball race. grinding machine; It isalso'possible to use thismachine for grinding other objects. 20.

tain the article being ground in the. correct ade' justed position.

"The fixture I34. as shown in Fig. 12, is of.120. angularity, whichcenters a rock bit segment B be pressed upward to hold-thebit'segment'in' place while the abrasive element I40, mounted on theshaft H9 is operated to perform the desired grinding action upon thebearing surfaces of the rock bit segment B". A screw -threade'd shaftI4I (Fig. 10) threadably engages a nut I42 which-is pivotally secured tothe undersideof the frame I03, and at'the' opposite end the threadedshaft-MI is secured against longitudinal'movement to a bracket I43,which bracket is secured to the" base II. By the turning of a handle MIon the screwthreadedsh'aft Ml, thetable'lil3 will be swung about thestandard I82 as a center, and this will vary the axial alignment ofrotary table I28 with' respect to grinder shaft i I9, thereby makingpossible minute adjustments for regulating the'dis-- tance between thegrinder Mil and the axial point of the work in the jig J.

In the operation of the device as shown in Figs.

1.1 to 12, inclusive..the rock'bit segment B or other'worlr, is fittedinto the'fiXtureIEIL'and in the caseof a rocl; bit'segmentB', dowel pinsare litted through holes inthe'jig 'andintd holes provided in the rockbit segment so asto index properly the rock bit segment which is clampedin'plac'e by the bar I31. By manipulation of the threaded shafts. I'andYl32 the tables I3I and I33 are shifted transversely with respecttoeach otherso as to' positionproperly the rock bitsegment B, which bit sement is mounted in the fixture I34.

Upon starting. the motor. I It, the grinder shaft I I9-is rotated at ahigh rate of. speed; By engagtightened so as to turn the rotary tableI28. to

pins to engage the work being handled. This holding fixture 'I347isreversible so vas to ac'com modate different sized articles that are tobe ground. v After the table, I SI has been adjusted trans verselyof thetable I2 8, screw jacks "I35,-p ro vided onueither' side of. the table.areftightened foradjusting thewtable to. the correct angularity withrespect to the rotarytable I 28.. Screw jacks.

I35 are provided for the adjustment of thetable l 33llto'the correctangularity, after the adiustment of thei screw-threaded shaft I32 hasbeen accomplished. The screw jacks I35 and I36 hold these tables inadjusted positionso as to mainrotate the bit segment'B' Fig. ll, 'in anannular path around theaxis of grinder ShaftIIQ.

As the grinding operation proceeds, the depth or the cutof the grinder liil is regulatedby turning "the screw-threaded shaft II4I which .willswing the frame I93 about the standard I02.

I A vertical adjustment of the. grinder shaft II9 is-obtained byrotatinga hand wheel I09 which has its inner bore threaded for engagement withthe threaded portion of the tubular shaft housing I99. When the properheight of the grinder M9, is obtained, a clamp screw I08 is'usedbindingly to engage the outer bifurcated portions of the split sleeve598.

It will be appreciated that this modified form V of the invention issimpleandcompact in construction and that it may be adjusted readily invarious ways to obtain the correct adjustments for performing variousgrindingoperations. V

While the invention has been illustrated and described in certainembodiments. it is recognized. that variations and changes may be madethere in, without departing from the invention except as specifiedin theclaims. p I v I claim: ,7 s r 1. In a vertical spindlegrindingmachine-of the character described, the combinations-f arotatable spindle having an abrading element mounted thereon, a powerdriven turntable associated with the abrading element and having aworkholder mounted on said turntable, said work hold-- er including ajig adapted to receive work therein, universal mounting means formounting the jig on the table for shifting movement thereof to differentangular positions relative thereto, and power means for driving saidspindle and said turntable in coordinated relation.

2. In an abrading machine of the character described, the combination ofan upright sleeve, an arm mounted on the sleeve and extending laterallytherefrom, a second sleeve carried by the arm, an upright spindlejournaled in the second sleeve, an abrading element carried by the lowerend of the spindle, a turntable rotat ably mounted below the abradingelement and having means for supporting work thereon in operativerelation with the abrading element, means mounting said arm for lateralswinging movement relative to the sleeve and for vertical adjustmentrelative thereto, a drive shaft associated with the first-mentionedsleeve, and means forming driving connections from said drive shaft tothe spindle and turntable.

3. In an abrading machine of the character de scribed, the combinationof an upright sleeve, an arm mounted on the sleeve and extendinglaterally therefrom, a second sleeve carried by the arm, an uprightspindle journaled in the second sleeve, an abrading element carried bythe lower end of the spindle, a turntable rotatably mounted below theabrading element and having means for supporting work thereon inoperative relation with the abrading element, means mounting said armfor lateral swinging movement relative to the sleeve and for verticaladjustment relative thereto, a drive shaft associated with thefirst-mentioned sleeve, means forming driving connections from saiddrive shaft to the spindle and turntable,

and means for holding the arm in adjusted positions of swinging movementfor different vertically adjusted positions of the spindle.

4. In an abrading machine of the character described, the combination ofan upright sleeve, an arm mounted on the sleeve and extending laterallytherefrom, a sec-0nd sleeve carried by the arm, an upright spindlejournaled in the second sleeve, an abrading element carried by the lowerend of the spindle, a turntable rotatably mounted below the abradingelement and having means for supporting work thereon in operativerelation with the abrading element, means mounting said arm for lateralswinging movement relative to the sleeve and for vertical adjustmentrelative thereto, a drive shaft associated with the first-mentionedsleeve, means forming driving connections from said drive shaft to thespindle and turntable, and means for clamping one of the sleeves and thearm in relatively vertically adjusted positions for holding the spindlein properly adjusted positions.

5. In an abrading machine of the character described, the combination ofan upright sleeve, an

arm mounted on the sleeve and extending laterally therefrom, a secondsleeve carried by the arm, an upright spindle journaled in the secondsleeve, an abrading element carried by the lower end of the spindle, aworkholder having means for supporting work thereon in operativerelation with the abrading element, means mounting said arm for lateralswinging movement, means 10 for adjusting the spindle vertically, aclamp in position for secure clamping engagement with at least one ofthe sleeves for holding the spindle in fixed position, and means forminga driving connection with the spindle.

6. A workholder for a grinding machine comprising a table, a jig mountedon the table and adapted for receiving work therein, a transverse shaftmounting means for mounting the jig on the table, a second transverseshaft positioned below said first mentioned shaft at substantially aright angle thereto, and means of moving said jig along said shafts,means for holding said jig in a fixed position, and means for rotatingsaid jig in coordinated relation to said grinding machine.

7. A workholcler for a grinding machine comprising a table, a jigadapted to receive work, a shaft carried by the table and extendingtransversely thereof, a support mounted on the shaft and carrying asecond table having a shaft mounted thereon at substantially a rightangle to said first mentioned shaft, a support mounted on said secondshaft and carrying the jig, means for adjusting the support axially ofsaid shafts and a clamp member extending upward for cooperative clampingwith work in said jig.

8. A workholder for a grinding machine comprising a jig fixturesubstantially inverted V- shaped in cross section adapted to receivework between the inner sides thereof, dowel pins carried by said innersides and extending inwardly therefrom substantially at right angles tosaid sides in positions to engage the work, a pair of screw memberspositioned on each side of said V-shaped fixture and having an abridgingscrew threaded bar therebetween and operatively connected therewith forclamping work in said fixture.

AMEDEE D. APPLEBY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 125,434 Battell et al Apr. 9,1872 551,243 Westphol Dec. 10, 1895 1,211,381 Alden Jan. 9, 19171,262,540 Miller 1 Apr. 9, 1918 1,869,413 Edgar Aug. 2, 1932 1,889,248Kilmer Nov. 29, 1932 1,981,174 Hille Nov. 20, 1934 2,076,682 StricklandApr. 13, 1937 2,246,023 Spurling June 17, 1941 2,269,946 Lange Jan. 13,1942 2,286,709 Barous June 16, 1942 2,357,510 Flygare et al Sept. 5,1944 2,398,628 Dykoski et a1 Apr. 16, 1946 2,413,795 Speed Jan. 7, 19472,420,606 McLeod et a1. May 13, 1947 2,432,058 Wiken et a1 Dec. 2, 19472,434,600 Swenson Jan. 13, 1948 2,453,573 Hager Nov. 9, 1948 2,486,108Brunel Oct. 25, 1949 FOREIGN PATENTS Number Country Date 253,335 ItalyJuly 7, 1927 561,722 Germany Oct. 17, 1932

